public class Demo17 {
   private static int count=0;
   private static Object locker=new Object();
    public static void main(String[] args) {
        
        Thread t1=new Thread(()->{
             synchronized(locker) {
                synchronized(locker){
            for(int i=0;i<50000;i++){
                    count++;
               }
           }
        }
        });
        Thread t2=new Thread(()->{
         synchronized(locker) {
            for(int i=0;i<50000;i++){
                    count++;
            }
            }
        });
        t1.start();
         t2.start();
        try {
            t1.join();
            t2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(count);
    }

}
